|Griffin, J - LA STATE UNIV. AG. CTR.|
|Clay, P - LA STATE UNIV. AG. CTR.|
|Ellis, J - LA STATE UNIV. AG. CTR.|
Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 1999
Publication Date: June 1, 1999
Citation: Griffin, J.L., Clay, P.A., Ellis, J.M., Hanks, J.E. 1999. Bermudagrass control with glyphosate using a sensor-controlled hooded sprayer in sugarcane.. Weed Science Society of America Meeting Abstracts. 39:164. Technical Abstract: Glyphosate (Roundup Ultra) was applied at 2.2 kg ai/ha under a hooded sprayer in mid-October 1996 to fields of CP 70-321 sugarcane planted eight weeks earlier. Bermudagrass ground cover was approximately 25% (experiment 1) and 40% (experiment 2). Control was compared using a standard hood and one equipped with four Weedseeker Model PhD 612 sensors with internal light tsources and solenoid/nozzle assemblies. Hoods were 122 cm wide and covered the row middles leaving a nontreated area approximately 61 cm wide on the row top. Use of the sensor-equipped hood resulted in 29 to 68% savings (experiment 1) and 5 to 27% savings (experiment 2) in spray volume compared with the standard hood that sprayed continuously. Bermudagrass control on the row tops and middles 24 d after treatment was 90 to 100% where both the standard and sensor-equipped hoods were used. A slight reduction (5 to 10%) in sugarcane plant height was observed 24 d after treatment. In late March the following year, bermudagrass ground cover was no more than 3% in eithe experiment where glyphosate was applied compared with 25% (experiment 1) and 61% (experiment 2) for the nontreated checks. In late October 1997, experiments were repeated at three locations where bermudagrass ground cover ranged from 15 to 60%. Use of the sensor-equipped hood resulted in an average savings in spray volume of 17 to 30%. Bermudagrass control was at least 94% and sugarcane was not injured. In all experiments sugarcane height and stalk populations in mid May were equivalent for treated and nontreated plots.